Objective To evaluate the necessary of peripheral iridectomy ( PI ) in cataract extraction and trabeculectomy surgeries.目的探讨周边虹膜 切除 术在白内障合并青光眼联合手术中的必要性....
可为煤气炉扩径和炉箅研制工作提供参考.It is helpful to the gasifier modification , such as furnace enlargement fire grate improvement, etc.环式烧结机炉箅条主要失效形式是烧蚀和折断.The main failure forms of fire bars in cycle type machine are burning erosion a...